US2078606A

US2078606A - Thermal insulation for valved pipe installation

Info

Publication number: US2078606A
Application number: US718670A
Authority: US
Inventors: Grand Joseph M Le
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-04-02
Filing date: 1934-04-02
Publication date: 1937-04-27
Anticipated expiration: 1954-04-27

Description

. April 27, w37- J. M. E GRAND 2,078,606

THERMAL INSULATION FOR VALVED PIPE INSTALLATION Filed April 2, 1934 9 Sheets-Sheet l N M o Xy ff.: W i: A 1:: l 'nza-n kfll A Y ALI-"X N NW N f EN W J. M. LE GRAND THERMAL INSULATION FOR vALvED PIPE INSTALLATION Filed April 2, 1934 9 Sheets-Sheet 2 ZZLU/QNOW: foeJU/Ml/cz Gym/zd Mig/wauw@ gags.

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April 27, 1937. J. M. LE GRAND THERMAL INSULATION FOR VALVED PIPE INSTALLATION Filed April 2, 1934 9 Sheets-Shea?I 4 foSe 5% April 27, 1937. .1. M. I E GRAND THERMAL INSULATION FOR VALVED PIPE INSTALLATION Filed April 2, 1954 9 Sheets-Sheet 5 122 ZlZ j/(Qaa 9 Sheets-Sheet 6 J. M. LE GRAND Filed April 2, 1934 THERMAL INSULATION FOR VALVED PIPE INSTALLATION April 27, 1937.

April 27, 1937. .1. M. LE GRAND THERMAL INSULATIGN FOR VALVED PIPE INSTALLATION Filed April 2, 1934 9 Sheets-Sheet 7 0121 se/O//Ml Grand -Plil 27, 1937 J. M. LE GRAND 2,078,606

THERMAL INSULATION FOR VALVED PIPE INSTALLATION Filed April 2, 1954 9 Sheets-Sheet `8 y I A .J-.QO JQ E l@ 5 7,):

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April 27, 1937. J. M. LE GRAND 2,078,606

THERMAL INSULATION FOR VALVED PIPE INSTALLATION Filed April 2, 1954 9 Sheets-Sheet 9 El/ IUO 7q SQJU/ML/e Gru/7,01

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Patented pr. 27, 1937 PATENT OFFICE THERMAL INSULATION FOR VALVED PIPE INSTALLATION Joseph M. Le Grand, Heathsville, Va.

Application April 2, 1934, Serial No. 718,670

30 Claims.

This invention relates to thermal insulation and it has to do particularly with structure for thermally insulating valved pipe installations.

One of the objects of the invention is to'provide improved means for thermally insulating installations of the foregoing character.

Another object is to provide means for thermally insulating pipes or sections thereof.

A further object is to provide improved means for thermally insulating pipe flanges and fittings which serve to interconnect adjacent pipe sections.

Still another object is to provide improved means for thermally insulating valves which control the flow of fluid, etc., through the pipe structure.

An additional object is to provide thermal insulation means for the foregoing purposes which includes a plurality of metallic sheets of sufficient stiffness and thickness to retain preformed shape and which are formed of a material which possesses relatively low reflective characteristics when exposed to radiation of wave lengths within the visible portion of the electromagnetic spectrum and relatively high reective characteristics when exposed to radiation of longer wave lengths than the visible portion of the electromagnetic spectrum, said sheets being spaced with respect to each other and to the structure insulated in the manner disclosed in Letters Patent No, 1,910,703, granted to me on May 23, 1933.

A more specific object is lto provide thermal insulation means of the foregoing character which includes a plurality of self-contained metallic units detachably mounted upon the valved pipe assembly, which units are of such character that they may be cheaply manufactured, they may be stocked ready for use in quantity by dealers, they may be easily and quickly applied to and removed from the structure to be insulated, and they may be used over and over again as the circumstances may require.

It is a further object of the invention to provide a thermal insulation for valved pipe structure which is of simple form; which is of light weight; which insures increased insulation efflciency at lower cost to the user; which is durable and will insulate with near maximum efciency throughout the life of the structure insulated; which is free from condensation effects under ordinary operating conditions; which insures a substantially uniform insulation effect throughout thc entire surface of the structure insulated; which is substantially reproof; which is proof against vermin, insects, bacteria, rodents and va rious gases; and which requires practically no maintenance attention when in sue.

Other objects and advantages will become apparent as this description progresses and by reference to the drawings Whereinz- Figure 1 is a side elevational view of one form of valved pipe' structure embodying my invention, this structure being particularly adapted for the conveyance of a hot fluid, gas, vapor, etc.

Fig. 2 is a top plan view of the structure shown in Fig. 1;

Fig. 3 is an enlarged, separated, perspective view of a portion of one of the pipe insulation units shown assembled in Figs. 1 and 2;

Fig. 4 is an enlarged, elevational view, partially in longitudinal section, of a portion of the pipe insulation structure shown in Fig. 1:

Fig. 5 is a cross-sectional view taken substantially on line 5-5 of Fig. 4;

Fig. 6 is a section taken substantially on line 6-6 of Fig. 5;

Fig. 7 is a section taken substantially on line 1 1 of Fig. 4;

Fig. 8 is an enlarged, separated perspective view of a washer-like member employed for blanking the ends of one pipe insulation unit from the ends of the adjacent units, which member is shown in dotted lines in a distended pipe-application position;

Fig. 9 is a longitudinal sectional view o1' a pipe structure embodying my invention and adapted for the conveyance of a cold fluid, gas, etc.;

Fig. 10 is a sectional view taken substantially on line IU-IU of Fig. 9;

Fig. 11 is a side elevational view, partially in l section, of another form of pipe insulation embodying my invention;

Fig. 12 is an enlarged longitudinal sectional view of the pipe flange insulation structure shown in Figs. 1 and 2, the same being taken substantially on line l2-i2 of Fig. 2;

Fig. 13 is another enlarged sectional view of the pipe flange insulation structure taken substantially on lines |3-I3 of Figs. 2 and 12;

Fig. 14 is a separated perspective view of one of the pipe flange insulation units shown in Figs. 12 and 13;

Fig. 15 is a separated perspective view of the gasket mounted between the unit of Fig. 14 and the pipe flange shown in Fig. 12;

Fig. 16 is an enlarged central longitudinal sectional view of the valve insulation structure shown in Figs. 1 and 2;

Fig. 17 is a section taken substantially on line on line -20 of Fig. 19, the valve insulation structure being shown partly in cross section and partly in elevation; and

Fig. 21 is a section taken substantially on line 2I-2I of Fig. 19.

The valved pipe structure or installation which I have chosen to illustrate my invention includes a plurality of pipe sections 30 joined together at their adjacent ends by pipe flanges 3l. The number of pipe sections will, of course, depend upon the length of the pipe installation; and, although I have shown a straight pipe arrangement, it will be understood that it may have various bends and turns therein to suit the particular conditions of installation. The pipe assembly includes therein one or more valves 32 for controlling the flow of the pipe contents therethrough. It will be understood that the pipe flanges 3| and the valves 32 may take the forms shown or any other well-known forms, to all of which my invention is equally well adapted.

In some instances, the pipe structure may be used for the carrying of a hot fluid or gas or vapor, such, for example, as hot water, hot air, or steam for'various heating and other purposes. It is desirable in most instances to insulate such structures against the loss of heat from the heated medium passing therethrough, and my invention is well adapted for that purpose. Such structures will be referred to herein as hot pipe structures or insulations.

In other instances the pipe structure may be employed for conveying a cold uid or the like, such, for example, as a refrigerating brine or cold air for air conditioning purposes; and pipe installations of this character will be referred to herein as cold pipe structure. It is highly desirable in many instances to insulate cold pipe structures against the transfer of heat, and my invention is also well suited for that purpose.

The insulation structure as a whole takes the form of a plurality of units, successively mounted one after the other upon and throughout the length of the valved pipe structure. Although these several units cooperate with each other to provide thermal insulation throughout the entire length of the pipe installation, inclusive of pipe flanges 3| and valve 32, the insulation structure per se for the different parts of the installation will be described separately to facilitate description and understanding of my invention.

Pipe insulation for "hot pipe structure This structure, which is illustrated in Figs. 1 to 8, inclusive, preferably takes the form of a plurality of semi-circular, self-contained units 40 that are secured in circumferentially-disposed pairs or groups upon the pipe section (Fig. 1). It will be understood, however, that, if desired, the units may be less than a semi-circle in crosssection so that a group of three or more may be employed to completely enclose the pipe without departing frommy invention.

Each unit comprises a plurality of spaced

metallic sheets

4I, 42, and 43 formed of a material which possesses relatively low reflective characteristics when exposed to radiation of wave lengths within the visible portion of the electromagnetic spectrum and relatively high reective characteristics when exposed to radlation of longer wave lengths than the visible portion of the electromagnetic spectrum, as more fully disclosed in my aforesaid patent. Such a material possesses relatively low reective efficiency when exposed to visible radiation and relatively high reflective efficiency when exposed to infra-red radiation. I have found that commercial black steel well serves this purpose, the sheets of steel being of sufficient stiff ness and thickness to retainpreformed shape. The thickness of the metal may be varied so long as the foregoing characteristics are retained. The outer sheet 4I is, preferably, of greater thickness than the other sheets for obvious protection purposes.

In carrying out my invention in connection with hot pipe insulation the metallic sheets are spaced preferably in the manner taught in my aforesaid patent. The metallic sheets are so constructed and arranged that they provide a plurality of unobstructed and substantially parallel air spaces which are practically sealed apart from each other. 'I'he metallic sheet 43 which is nearest the hot pipe 3D is spaced comparatively close thereto and the remaining sheets 42 and 4I are spaced progressively farther apart as they approach the outside of the structure.

The metallic sheets are, preferably, spaced in accordance with the radiation frequency derived from the existent temperature difference ranges. That is to say, the

metallic sheets

4I, 42, and 43 are so spaced with respect to the hot pipe section 30 that the wall of the pipe section 30 and the outer sheet 4I form an insulatingr space of certain width. The remaining

sheets

42 and 43 are so spaced apart and grouped that the central plane of the same (as a group) vlies closer to the hot pipe 30 than to the outerv sheet 4i. I have found that excellent results are obtained by so grouping the sheets that the central plane of the group of

sheets

42 and 43 is spaced from the hot pipe 3D a distance which falls Within the dimensional limits of less than one-half and f more than one-third of the distance between the hot pipe 30 and the outer wall 4|. In this way, the

metallic sheets

4I, 42 and 43 are spaced with respect to the hot pipe 30, and with respect to each other, in suchY a manner as to gainv the near maximum insulation against the transfer of heat by radiation, convection and conduction. It is to be understood, however, that so far as certain of the structural features of my invention are concerned, the kind of material employed and the relative spacing of the sheets may be varied somewhat without departing from my invention.

Each metallic sheet of proper sizeis formed to a semi-circular shape with outwardly-projecting flanges 44 extending along and throughout its longitudinal edges. The sheets of each unit are xedly secured together by lateral strips 45; the flanged edges of the sheets being provided with pockets 46 to receive such strips. The strips 45 are welded, or otherwise secured, in the pockets 46 which are of a depth equal to the thickness of the strips 45 so that the exposed strip surfaces are flush with the adjacent surfaces of the sheet flanges 44. The strips 45 are located at properly spaced points along the sheet edges and they are formed, preferably, of a highchrome nickel alloy of low heat conductivity. This material has approximately only 1/3 of the heat-conduction lcapacity of the metallic sheets 4i to 43, whereby heat loss by conduction along the strips 45 is minimized. Fastening devices 41 pass through the strips 45 and outer sheet flanges 44 for securing the units 40 of each pair or group rmly together upon the pipe section.

The innermost metallic sheet 43 of each unit 40 is provided with a plurality of indents 4B of a depth substantially equal to the distance the sheet 43 is to be spaced from the hot pipe 3i). When a pair of units 40 is placed in position upon the pipe section and the fastening devices 4l are secured. the indents 48 (which are preferably arranged at approximately 90 degrees apart for uniform spacing of the sheet 43) are brought into firm seated engagement with the pipe 30 so that the pair or group of units is tightly clamped upon, and will be held in denite position upon the pipe with the flanges 44 of adjacent units of each pair or group seated rmiy upon each other.

In certain instances, good results may be obtained by employing a comparatively thin gasket (not shown), formed of any suitable non-conducting material, between the units of each pair or group. In this arrangement, there is provided around the pipe a plurality of semi-circular air spaces which are substantially sealed apart from each other. Such a gasket may extend from the outer edge of the outer sheet flange 44 to the pipe 30 or only to the inner sheet 43.

From the foregoing, it Will be seen that when each pair or group of units is assembled upon the pipe, the metallic sheets form with respect to each other and with respect to the pipe 30 a plurality of disconnected, substantially parallel air spaces 50, 5i. and 52, which progressively increase in Width from the pipe 30 to the outer sheet 4i. The relative widths of these spaces are, preferably, those provided by spacing the sheets in the manner hereinabove described, whereby highly efcient results are obtained in preventing transfer of heat from the contents of pipe 30 past the insulation structure. The number of sheets employed in each unit may be varied, and in that case the several sheets should, preierably, be spaced in the manner already described.

lThe units 40 are of comparatively short length so that they may be readily and easily manufactured, shipped, stocked and handled. Several pairs or groups of units 40 may be required to cover a single pipe section 3l), as shown in Fig. 1. and for best results I blank-off each pair of units from the next adjacent pair.

The ends of the units 40 are so constructed that the ends of the

insulation spaces

50, 5I, and 52 are open. To minimize the formation of convection currents when the several units are assembled in endwise relation upon the pipe structure, as weil as to increase the insulation efficiency of the structure as a whole, I employ means for blanking off these spaces at the adjacent ends of the units. To this end, I preferably employ a comparatively thin metallic disk or washer-like member 53 (Figs. 1, 2, 4, and 8) which may be formed of a high chrome nickel alloy material having the same thermal characterstics as the material employed for the strips 45. The body of this Washer or disk 53 is of suicient width to extend from the pipe 30 throughout the width of and slightly beyond the insulation unit 40. It is split at 54 so that it may be exed and spread apart (as illustrated in dotted lines in Fig. 8) for ready application to the pipe 30. In use, a pair of units 40 are first secured in place upon the pipe section, after which the disk 53 is placed npon the pipe against the ends of the

sheets

4i, 42, and 43. When another pair of units is applied, their ends are brought into position against the disk 53 so that a single disk seals the adjacent ends of the respective air spaces of adjacently-mounted unit pairs.

Pipe sections are usually made up in standard lengt-hs. The insulation units 40 are, preferably, of such length that a predetermined number of the same, successively applied in lengthwise relation, will nt the stadard pipe length. However. should the pipe length vary to suit certain pariicular installation conditions. the units are of such character that they may be trimmed down in length to t the particular installation requirements.

Pipe insulation for "cold pipe structure Structure of the character illustrated in Figs. 9 and 10 may be employed for insulating co1d" pipe structure in accordance with my invention.

This structure is similar to that shown in Figs. l to 8, inclusive, except that the metallic sheets are mounted in reversed fashion to accommodate the reversed heat iiow condition. The sheets of each unit are so spaced with respect to each other and to the pipe to be insulated that the outermost sheet is located comparatively close to the next sheet, and the other sheet or sheets and the pipe are spaced progressively farther apart toward the pipe. This arrangement provides a comparatively narrow insulating space adjacent the higher temperature area (the at- Y mosphere) with the remaining spaces oi progressivcly increasing depth toward the lower temperature area (the cold pipe).

Specifically, this insulation structure is compris^d nf a plurality of units of semi-circular shape joined together and mounted upon the cold pipev Bi in pairs. Each unit Si! comprises

metallic sheets

62, 53, and 64 which are formed of the same maierial as the sheets of the previously-described unit 4U. The

sheets

82 and 63 are spaced apart a comparatively short distance while the sheets B3 and 64 and the pipe 6l are spaced apart progressively increasing distances.

Other than above described, the structure sbo-wn in Figs. 9 and l0 is the same as that of Figs. 1 to 8, inclusive, except that the indents 65 formed on the inner sheets B4 of the units 60 are of greater depth to accommodate the increased spacing of the inner sheet 64 from the cold pipe 6|. as occasioned by the reverse heat flow condition.

"Hot pipe insulation modification The metallic sheets of the insulating units 40 and 60 are preferably plain-surfaced; however, if desired, the sheets may be preformed to provide angular surfaces therein for increased strength, durability and insulation effects. One form of insulation structure of this modified character is illustrated in Fig. l1.

This structure includes a plurality oi' units '10, each of which is of semi-circular shape and comprises a plurality of metallic sheets 1|, 12, and 13. Each metalilc sheet 1|, '12. and 13 is provided with a plurality of similar and uniformly-spaced corrugaiions 15 which extend circumferentially throughout the length of the sheets. By corrugating the sheets in this manner, they are provided with a plurality of surfaces angular with the normal whereby an increased insulation value is added to the structure as a whole as more particularly pointed out in my aforesaid patent. The corrugations further add strength and rigidity to each sheet and to the structure as a whole.

The several sheets 1|, 12, and 13 are spaced apart with respect to each other and with respect to the hot pipe 16 in the manner disclosed in Fig. 4. The units 10 are mounted in pairs upon the pipe 16, and the normally open ends of the spaces of adjacent units are blanked off by washer or disk members 11 formed of a high chrome nickel alloy of low heat-conduction capacity.

Pipe ,flange insulation for hot pipe structure The pipe ilanges 3| of Fig. l may take any desired form, such, for example, as the flange shown in Fig. l2. In this case, the ange hubs are threaded upon the ends of the pipes 30 and the adjacent flanges are secured together by bolts and nuts 8| and 82 to hold the ends of the pipes in cndwise abuttingr and sealed relation.

According to my invention, these pipe flanges are insulated against the transfer of heat by radiation, convection and conduction and one form of structure for carrying out my invention is shown in Figs. 12 to l5, inclusive.

This flange insulation structure is of a character adapted to carry forward the insulation eifects and features of the insulation structure covering the pipe sections 30. In the structure illustrated, I have provided a cooperative relationship between the pipe insulation units 40 and the flange insulation structure which accomplishesthis purpose whereby a substantially uniform insulation efficiency is obtained throughout the entire structure insulated.

The flange insulation structure takes the form, preferably, of a pair of semi-circular units 83 (Fig. i4). Each unit consists of an outer semicircular metallic shell 89 of U-shape in crosssection and smaller and similarly-shaped inner metallic shell 85. The inner shell 85 is provided with outwardly-extending flanges 86 along its curved edges which are welded, or otherwise secured, to the curved edges of the outer shell 84 for securing these shells together in a predetermined, fixed and spaced relationship. If desired. the inner shell flanges 86 may take the form of separate strips of high chrome nickel alloy material (similar to that of the strips 45) welded, or otherwise secured, to the respective sections 84 and 85: or spaced bridge strips of like material may be secured to the

sections

84 and 85 at spaced points around and between the sections for a similar purpose.

The outer shell 84 is of such width that its opposite side walls 81 are disposed on opposite sides of the pipe flanges 3|, preferably` in abutting relationship with the high chrome nickel alloy blanking washers or disks 53 at the adjacent ends of the pipe insulation units 40.

The inner and

outer shells

84 and 85 are of such relative size that the space between their

U-base portions

88 and 89 is of greater depth than the space between their

sides

81 and 90. In this deeper space, between the

shell base portions

88 and 89, there is mounted a metallic sheet 92 in parallel relation with respect to the

shell base portions

88 and 89. The sheet 92 extends throughout the width of the outer shell 84 and it is welded. or otherwise secured, along its side edges to the outer shell side walls 81. The

sheet 92 is so spaced from the

shell walls

88 and 89 that there is formed a sealed air space 93 of uniform depth around the inner shell 85 and a wider space 94 between the sheet 92 and the wall 89 of the outer shell. The inner shell 85 is of sufficient size to fit over the flanges 3| and the vflange-fastening devices 8|, 82 in spaced relation thereto providing a shallow insulating space 95 between the inner shell 85 and pipe flanges 3| of less depth than the space 93. i

It will be seen from the foregoing .that each unit 83 is of all-metal construction. The material from which these units are formed is, preferably, the same as that from which the pipe insulation units 40 are formed. That is to say, this material (preferably, commercial black steel) is of suilicient stiffness and thickness to retain preformed shape and it is of a dull non-bright character which possesses relatively low reflective characteristics when exposed to radiation falling within the wave lengths of the visible portion of the electromagnetic spectrum and relatively high reflective characteristics when exposed to radiation of wave lengths longer than the visible portion of the electromagnetic spectrum. '.Also, the metallic walls of the units 83 are spaced (with respect to each other and to the flanges 3|) similarly to the metallic sheets 4|, 42 and 43 ofthe pipe insulation units 40 so as to provide a relatively shallow space 95 next to the hot flanges 3| any suitable non-.heat-conducting material may be mounted between the inner shell flanges 85 and the flange hubs 80 and between the units 83. unit 83 and it, preferably, takes the form shown in Figs. 13 and l5. Specifically, this gasket has a fiat portion |00 of substantially the shape of the ends of the units 83 which is large enough to cover the ends of the unit spaces 93. 94 and the shell flange 96 and to extend inwardly to the pipe flanges 3| (Figs. 12 and 13). This gasket further includes a semi-circular portion having4 spaced legs |8| adapted to t between the inner shell flanges 86 and the flange hubs 80. vWhen the units are assembled upon the flanges 3|, the gaskets 99 seal the ends of the air spaces provided by one unit from the ends of the air spaces of the other unit so that a plurality'of semicircular, substantially-sealed air spaces 93. 94

and 95 are provided in which the tendency toward the formation of convection currents is minimized. When the fastening devices 98 are se cured in place, the units 83 are drawn tightly together and tightly down against the gasket legs |0| so that the structure as a whole is firmly clamped upon the flanges 3|. If desired, the gaskets 99 may be dispensed with, in which case the metallic units would seat directly against the flange hubs 88.

One such gasket 99 is employed for each It will be understood that in insulating pipe flanges for cold pipe structure, the

shells

84 and 85 and the sheet 92 will be so relatively sized and arranged that the outermost space, corresponding to the space 94, will be comparatively shallow with the other spaces, corresponding to the

spaces

93 and 95, progressively increasing in depth towards the flanges 3|. An arrangement oi this character is shown in Fig. 19 which will be described more fully hereinafter.

Valve insulation for "hot pipe structure The valve insulation structure is arranged to provide the desired insulation eiect cooperatively with the insulation structure for the adjacent parts of the valved pipe structure. This structure, like that for the pipe sections and the pipe anges, takes the form of self-contained units which may be readily and easily applied to and removed from the valve without disturbing the valved pipe assembly in any manner whatsoever.

More particularly, with respect to Figs. 16, 17, and 18, the valve 32 is of the so-called gate type having a body I I with flanges I I at the opposite ends thereon for securement to the adjacent flanges 3| carried by the adjacent pipe sections 30. The valve flanges are secured to the pipe anges 3| by suitable fastening devices I|2, the valve and pipe flange structure being similar to the flange structure by which adjacent pipe sections 30 (Figs. 12-14) are secured together. The body portion ||0 of the valve is extended upwardly and it supports a valve stem ||3 adapted to be rotated by the hand wheel 4 to open and close suitable valve mechanism (not shown) contained within the valve body I I0.

The structure for insulating the valve 32 preferably takes the form of a pair of self-contained metallic units ||5 of identical construction and only one of them will be described in detail.

The valve unit ||5 takes the general outline shape of one-half of the valve body, being adapted to fit sidewise thereupon. It includes a plurality of spaced, parallel metallic sheets ||6, and I|8 which are, preferably, formed of the same material possessing the same characteristics and properties as the sheets employed for the pipe and

flange units

40 and 83, respectively, hereinbefore described. Each of the metallic sheets IIB, I I1, and I I8 is of semi-circular outline shape and they conform substantially to the outline shape of the valve structure. They are arranged in group fashion, leaving only the hand wheel ||4 free for ready operation.

The innermost metallic sheet IIB is of sufiicient size to fit freely over the valve body in spaced relation thereto. The other sheets and ||8 are supported progressively increasing distances apart toward the outer part of the structure. The spacing of these sheets is similar to spacing of the pipe insulation sheets 4|, 42, and 43. That is to say, the space ||9 between the sheet |I6 and the valve body (higher temperature area) is comparatively shallow. except where the irregular shape of the valve structure prohibits it, and the other spaces and |2| formed by the sheets ||'I and ||0 are of progressively increasing depth toward the outside or lower temperature area. In this manner the spacing features and requirements of my aforesaid patent are included in the valve insulation structure like in the pipe (Figs. 1-8) and ange (Figs. 12-14) insulation structure already described.

The metallic sheets IIi, and IIB are supported in the foregoing spaced relationship as a unit, as follows: The upper end portions IIB, II'IB, and ||88L of the sheets are turned horizon-r tally inwardly toward the valve stem ||3 and these end portions are provided with aligned, semi-circular openings concentric with the valve stem 3. The edges of the metallic sheets defining these openings are secured by welding, or otherwise, to a comparatively thin, semi-circular metallic strip |22 formed of a high chrome nickel alloy material oflow heat conductivity. The strip |22 is adapted to fit rather closely around a half portion of the circumference of the valve stem |I3. The lower parts of the vertical portions of the metallic sheets are provided with aligned semi-circular openings concentric with the horizontal axis of the valve body ||0. The edges of the metallic sheets defining these openings are secured by welding, or otherwise, to a semi-circular strip |23 similar, except for size, to the strip |22. The strip |23 is adapted to t rather closely around a half portion of the cir cumference of the rounded ends of the valve body |I0. The sheet edges between the strips |22 and |23 are secured by welding, or otherwise, to metallic strips |24 formed of the same material as the strips |22 and |23; and the bottom sheet edges between the strips |23 are likewise secured to a similar strip |25. The strips |22, |23, |24, and |25 may be formed as a single continuous piece having sections |22, |23, |24, and.

|25, or they may be formed and secured as separate pieces, as desired. These strips are of suiiicient width to close and substantially seal the air spaces |20 and |2| of one unit ||5 apart from each other and from the corresponding spaces of the other unit ||5 when the two units are assembled upon the valve. The vertical strips |24 are provided with spaced. outwardly extending ears |26 which receive fastening devices I2'I for securement of the units ||5 together. If desired, good results may be obtained by omitting the strip sections |24 and |25 and, instead, providing the sheet edges with flanges and supporting strips similar to the anges 44 and strips of Figs. 1 to 8. In that case, also, the units would be secured together similarly to the units of Figs. 1 to 8.

In applying the pair of units to the valve structure, gaskets |28 and |32 formed of any suitable non-heat-conducting material may be mounted between the adjacent sheet-supporting and space-blanking strips |24 and |25, respectively. Gaskets |29 and |30 formed of a similar material may be mounted between the strips |23 and the valve body I I0 and between the strip |22 and the valve stem II3. The gaskets |28, |20. |30 and |32 may be formed as one continuous piece (with sections |28, |29, |30, and |32) or as separate pieces, as above described. Or, if desired, these gaskets may be omitted with good results. The gaskets serve to more securely seal the joints between the units ||5 and between the units and the valve structure, as well as to reduce to the minimum metal-tometal contact between the insulation units themselves and between such units and the valve structure to further minimize heat loss by conduction. When the insulation units are tightly drawn together by the fastening devices |21, the semi-circular strips I 22 and |23 are tightly clamped around and upon the valve stem ||3 and circular valve body ends. respectively, to hold the insulation structure as a whole in a. xed position upon the valve.

The flange structure 3| between the valve 32 and the pipe sections 30 is, preferably, insulated by structure |3| like that shown in Figs. 12, 13, and 14 and it, therefore, need not be described in further detail. The length of the valve insulation units is such that when the flange insulation |3| and the valve insulation are assembled (Fig. 16) the outer valve insulation sheet ||8 abuts the adjacent outer side wall 81 of the flange insulation |3| whereby complete insulation coverage is provided throughout the valve structure.

Valve insulation for cold pipe structure Valveinsulation, according to my invention, for cold pipe installations may take practically the same form as the insulation for hot pipe installations previously described, except for reversed sheet spacing to accommodate the reversed heat flow condition. Insulation of this character is illustrated in Figs. 19 to 21, inclusive.

This structure includes a pair of identical allmetal units |40, only one of which will be described in detail. Each unit comprises metallic sheets |4|, |42, and |43 formed, preferably, of the same kind of material (and having the same insulating characteristics and properties) as the material employed for the sheets of the previously described pipe, flange and valve insulating units. The units |40 are so shaped that, when they are assembled upon the valve |44, they provide a shell-like structure covering practically all of the valve |44 except the hand wheel |45 thereof. lTo approximate generally, the outline shape of valve |44, the metallic sheets |4|, |42 and |43 are so shaped that the lower part of the assembled shell-like structure, which covers the valve body |46, is of rectangular shape in horizontal section (Fig. 21) and its upper part above the valve body |46 is of inverted V-shape in cross section (Fig. 20).

The metallic sheets of each unit |46 are supported in parallel spaced relation by metallic strips (or sections of a continuous strip) |41, |48, |49, and |50 of high chrome nickel alloy material which are similar to the metallic strips or sections |22, |24, |23, and |25, respectively, of the form of valve insulation of Fig. 16. Additional support is afforded by metallic spacers |10 (Fig. 21) secured by welding or otherwise, to the corner portions 'of adjacent sheets |4|, |42, and |43. These spacers |40 are, preferably, located at spaced intervals throughout the height of the sheets, and they are formed of a high chrome nickel alloy material similar to that used for the strips |41-|50. The strips or sections |41|50 seal the spaces |5| and |52 between the sheets |4|, |42, and |43 apart from each other and from the corresponding spaces of the other unit when the two units are assembled.

' The sheet |4|, |42, and |43 may be plain surfaced or they may be preformed to provide, in each thereof, a plurality of angular and intersecting plane surfaces of the character disclosed in my aforesaid patent. For example, the surfaces of the sheets forming the top, bottom and side walls of the shell-like units may be preformed to provide therein angular intersecting plane surfaces |68. Ribs |69 may be provided at the points of intersection of the plane surfaces, successive ribs |69 being formed in opposite directions for reasons which will be well understood from my aforesaid patent. Or, if desired, all of the surfaces of the sheets |4|, |42 and |43 may be thusly preformed for increased strength and insulation advantages. v l

Further construction of this form of valve insulating structure is substantially the same as that of Fig. 16. The operation of these valve insulation structures is similar except for thc reversed functioning of the structures due to reversed sheet spacing.

Flange insulation structure embodying my invention and adapted for cold" pipe structure is illustrated in Fig. 19, This structure is similar to that shown in Figs. 12, 13, 14, and 16 except for reversed spacing of metallic insulating surfaces to accommodate reversed heat flow conditions.

Specifically, the outer shell |6|, inner shell |62 and sheet |63 are so sized, spaced and related with respect to each other and to the pipe-andvalve flange |64 that the outermost space |65 (next to the higher temperature area) is comparatively shallow and the other spaces |66 and |61 progressively increase in depth toward the flange structure |64 (lower temperature area). In all other respects, including kind of material, and spacing relationship ofthe parts, this cold flange insulation structure is similar to the hot" flange insulation structure of Figs 12-14, `16.

Operation or walls formed of a material (such as commercial black steel) which has a lowv degree of reflectivity when exposed to visible light and which increases in reflective ability when exposed to radiant heat. These walls or surfaces, although heat conductingper se, are utilized to practically reduce to the minimum the transfer of heat by radiation, convection and conduction by spacingsuch sheets from each other and from the structure insulated, in a manner predetermined by the radiation frequency.

The insulation structure, throughout the length of the pipe installation, inclusive of that for the pipe sections, hanged joints and valves takes the form of a plurality of all-metal units which may be easily and quickly applied and removed. These units are of simple construction and are light in weight and may be manufactured very cheaply. Furthermore. the several units are very durable and may be used over and over again with substantially uniform insulation efficiency. The inherent deficiencies of prior pipe insulations, including break down due to vibration, loss of insulation properties duc to psychrometric conditions. bacteria, etc., are avoided.

CII

It is to be understood that my invention is not limited to the specic embodiments shown in the drawings, but that various changes may be made in the parts and the arrangements thereof without departing from my invention as defined by the claims which follow.

I claim:

1. In structure of the class described, a plurality of self-contained units adapted to be mounted upon the structure insulated in enclosing relation with respect to the latter, said units being mounted in annularly arranged groups with the several groups mounted closely adjacent each other in succession throughout the length of the structure insulated, each said unit comprising a plurality of steel sheets, means for holding said sheets in spaced relation with respect to each other, and means for securing each 'group of units together and upon the structure insulated independently of other adjacent groups of units.

2. In structure of the class described, a plurality of self-contained units adapted to be mounted upon the structure insulated in enclosing relation with respect to the latter, said units being mounted in annularly arranged groups with the several groups mounted closely adjacent each other in succession throughout the length of the structure insulated, each said unit comprising a plurality of commercial black steel sheets, means for holding said sheets in spaced relation with respect to each other, and means for securing each group of units together and upon the structure insulated independently of other adjacent groups of units.

3. In structure of the class described, a plurality of self-contained units adapted to be mounted upon the structure insulated, said units being arranged in annularly-disposed group which are mounted closely adjacent each other in succession throughout the length of the structure insulated, each said unit comprising a plurality of sheets formed of metal of sulcient stiffness and thickness to withstand preformed shape and possessing relatively low reilective eiciency when exposed to visible radiation and relatively high reflective eiciency when exposed to infra-red radiation of Wave lengths longer than the visible portion of the electromagnetic spectrum, means for holding said sheets in spaced relation with respect to each other, and means secured to the outermost of said sheets of each unit for the reception of fastening devices for securing each group of units together upon the structure insulated.

4. In structure of the class described, a group of self-contained metallic units adapted to completely enclose the structure to be insulated, each said unit comprising a plurality of metallic sheets of suncient stiffness and thickness to withstand preformed shape and formed of a dull non-bright material possessing relatively low reflective characteristics when exposed to visible light and relatively high refiective characteristics when exposed to radiant heat, means for holding said sheets in a predetermined spaced relationship with respect to each other, and means associated with said sheet holding means for securing said units together and upon the structure insulated.

5. In structure of the class described, a plurality of self-contained units adapted to be mounted upon the structure insulated, said units being arranged in groups which surround the structure insulated, which groups are mounted .closely adjacent each other in succession throughout the length of the lstructure insulated, each said unit comprising a plurality of sheets, means for holding said sheets in such spaced relation with respect to each other that a comparatively sha1- low air space is provided adjacent the higher temperature area and the other air spaces progressively increase in depth toward the lower temperature area, and means for securing each group of units together upon the structure insulated independently of any of the other groups of units.

6. In structure of the class described, a plurality of units arranged in groups to completely surround the structure insulated. said groups being mounted closely adjacent each other throughout the length of the structure insulated, each said unit comprising a plurality of metallic sheets, metallic strips having relatively low thermal conductivity secured to the side edges of said sheets for holding the latter in predetermined spaced relationship with respect to each other, and means associated with said strips for securing said units together upon the structure insulated.

'7. In structure of the class described, a plurality of units arranged in groups to completely surround the structure insulated, said groups being mounted closely adjacent each other throughout the length of the structure insulated, each said unit comprising a plurality of metallic sheets, spaced metallic strips having relatively low thermal conductivity secured to the side edges of said sheets for holding the latter in predetermined spaced relationship with respect to I of metallic sheets, means for holding said sheets in spaced relation to each other, means for securing the units of each group together upon the structure insulated, and gasket means formed of a non-heat-conducting material disposed between the units of each group.

9. In thermal insulation for pipes, a plurality of semi-circular metallic units arranged in pairs around the pipe, each said unit comprising a plurality of metallic sheets of semi-circular form, metallic members ol low heat conductivity secured to the side edges of said sheets holding the latter in spaced relation with respect to each other and sealing the side edges of the air spaces between said sheets apart from each other, means associated with said members for securing each pair of units upon the pipe, and means associated with the innermost of said metallic sheets for spacing said units a predetermined distance from the pipe.

10. In thermal insulation for pipes, a plurality of parti-circular metallic units arranged in groups around the pipe, each said unit comprising a plurality of metallic sheets of semi-circular form, metallic members of low heat conductivity secured to the side edges of said sheets holding the latter in spaced relation with respect to each other, means associated with said members for securing each group of units upon the pipe, and means associated with the innermost of said metallic sheets for spacing said units a predetermined distance from the pipe.

ll. In thermal insulation for pipes, a plurality of parti-circular metallic units arranged around the pipe, eachvsaid unit comprising a plurality of metallic sheets of similar parti-circular form having low reilective characteristics when exposed to visible light and high reflective characteristics when exposed to radiant heat, metallic members of relatively low heat conductivity secured t0 the side edges of said sheets holding the latter in spaced relation with respect to each other, said sheets being so spaced with respect to each other and to the pipe that the space next adjacent the higher temperature arca is comparatively shallow and the other spaces ore of progressively increasing depth toward the lower temperature area, means associated with said members lor securing said units upon the pipe, and means associated with the innermost oi said metallic sheets for spacing said units a predetermined distance from the pipe,

12. Pipe insulation structure which includes a self-contained unit comprising a plurality of imperorate metallic sheets of sufficient stiliness and thickness to withstand preformed shape, strips secured along the side edges of said sheets for holding the lat-ter in predetermined spaced relation without obstruction in the space therebetween, and a plurality of indent-s of predetermined depth in the metallic sheet next adjacent the pipe adapted to engage the latter only and space the units a predetermined distance from the pipe.

13. Pipe insulation structure which includes a self-contained unit comprising a plurality oi imperforate metallic sheets of suicient stiiness and thickness to withstand preformed shape. and formed of a. material which possesses relatively low reflective ability when exposed to visible light and relatively light reflecllve ability when exposed to radiant heat, strips oi relatively low heat conductivity secured along the side edges of said sheets for holdingr the latter in predetermined spaced relation, a plurality oi indents of predetermined depth in the metallic sheet next adjacent the pipe adapted to engage the latter and space the unit a predetermined distance from the pipe, and means associated with said strips for securement of the unit upon the pipe.

14. Pipe insulation structure which comprises a plurality of units of arc segments in form mounted around the periphery of pipe, each of said units comprisingr a plurality of metallic sheets, means for supporting said sheets in spaced relation with respect to each other, the innermost of said sheets being provided with means for spacing said units from the pipe, and

means which, together with said sheet supporting means, is adapted to blank-oil the spaces between said sheets and between said units and plurality of metallic sheets, means for holding said sheets in spaced relation with respect to each other and with respect to the pipo, means for securing a group of said units together around the pipe enclosing the latter, and

means carried by the pipe and blanking the ends of all the spaces between the sheets of the unit of one group from the corresponding spaces of' the next successive group of units,

16. Pipe insulation structure which comprises a plurality or parti-circular units mounted in groups upon the pipe, each said unit comprising a plurality of metallic sheets, means for holding said sheets in spaced relation with respect to each other and with respect to the pipe, means for securing each group of said units together, and a comparatively thin metallic disk formed of a material of low heat conductivity mounted upon the pipe between the adjacent ends of successive groups of units and blanking the ends of the spaces of one group of units from the corresponding spaces of the next successive group of units.

17. Pipe insulation structure which comprises a plurality of parti-circular units mounted in groups around the pipe, each said unit comprising a plurality of metallic sheets, strips formed of a metal of relatively low thermal conductivity secured to the side edges of said sheets supporting the latter in -spaced relation with respect to each other, means spacing said units from the pipe, means for securing each said group of units together, and means carried by the pipe and adapted to blank-off the ends of the spaces of one group of units from the ends of the spaces of next adjacent group of units.

18. Pipe insulation structure which comprises a plurality of parti-circular units mounted in pairs upon the pipe, each said unit comprising a plurality of metallic sheets, strips formed of a metal of relatively low thermal conductivity secured to the side edges of said sheets supporting the latter in spaced relation with respect to each other, means spacing said units from the pipe, means for securing each said pair of units together, and a relatively thin metallic disk formed of a material of low thermal conductivity detachably mounted upon the pipe between and abutting the adjacent ends of successively mounted pairs of units for blanking-ofi the ends of the spaces provided by the pair of units.

19, In structure for thermally insulating pipes, a group of all-metal units adapted to t upon and completely enclose the pipe, each said unit comprising a plurality of similarly-shaped metallic sheets semi-circular in cross-section and each corrugated circumferentially throughout their length providing a plurality of angularly disposed surfaces therein, means secured to the side edges of said sheets for holding the latter in spaced relation, and means cooperating with said latter means for securing said units together and upon the pipe.

20. Pipe ange insulating structure which comprises self-contained all-metal units of semicircular shape., each said unit comprising an outer parti-circular shell, a smaller and similarly shaped inner shell, means for securing said two shells together in spaced relation, said inner shell being adapted to t over the pipe ange in spaced relation thereto, a parti-circular' sheet mounted in the space between said shells in spaced relation thereto, and means for securing said units together for securement of the latter upon the pipe flange.

21. Pipe flange insulating structure which comprises all-metal units of parti-circular-shape,

each said unit comprising an outer parti-circular' shell, a smaller and similarly shaped inner shell,

lil)

means lfor securing said two shells together in spaced relation, said inner shell being adapted to ilt over the pipe ange in spaced relation thereto, a parti-circular sheet mounted in the space between said shells in spaced relation thereto, said shells and sheet being formed of a material of suicient vstiffness and thickness to retain preformed shape and possessing relatively low reflective characteristics when exposed to radiation of wave lengths falling within the visible-portion of the electromagnetic spectrum and relatively high reective characteristics when exposed to wavelengths longer than the visible portion of the electromagnetic spectrum,

and means securing said units together upon the pipe ange.

22. Pipe flange insulating structure which comprises a pair of self-contained all-metal units of semi-circular shape, each said unit comprising an outer semi-circular shell, a smaller and similarly shaped inner shell, means for securing said two shells together in spaced relation, said inner shell being adapted to fit over the pipe flange in spaced relation thereto, a semi-circular sheet mountedA in the space between said shells in spaced relation thereto, the walls of said shells, said sheet and the pipe flange being so relatively spaced with respect to each other that the space adjacent the higher temperature area is of shallow depth and the other spaces are of progressively increased depth toward the lower temperature area, and means for securing said units together and upon the pipe flange without disturbing said spaced relation.

23. Structure for thermally insulating pipe anges which includes a parti-circular outer metallic shell of U`shape in cross-section and having side walls and U-base walls, a smaller and similarly shaped metallic inner shell, the shell side walls being spaced apart a less distance than their base walls, means for securing said shells together in spaced and substantially parallel relation, a metallic sheet mounted in the deeper space between the shell base walls and substantially parallel with and spaced from the base wall of the inner shell a distance substantially equal to the distance between the shell side walls, and means associated with the outer shell for securing said shells as a unit upon the structure insulated.

24. Structure for thermally insulating pipe anges which includes a parti-circular outer metallic shell of U-shape in cross-section, a smaller and. similarly shaped metallic inner shell, the shell side walls being spaced apart a less distance than their base walls, means for securing said shells together in spaced and substantially parallel relation, a metallic sheet mounted in the deeper space between the shell base walls and substantially parallel with and spaced from the base wall of the inner shell a distance substantially equal to the distance between the shell side walls, and means for blanking-off the ends of the shell spaces when the insulating structure is mounted upon the pipe flange.

25. Structure for thermally insulating pipe flanges which comprises a pair of parti-circular, metallic units each of which includes a particircular outer shell of U-shape in cross-section, a smaller and similarly shaped inner shell, the shell side walls being spaced apart a less distance than their base walls, means for securing said shells together in spaced relation, a metallic sheet mounted in the deeper space between the shell base walls and spaced from the base wall of the inner shell a distance substantially equal to the distance between the shell side walls, and gasket structure mounted over` the ends of said units and between said units and the pipe flange for blanking-off the ends of the shell spaces when the insulating structure is mounted upon the pipe flange and minimizing heat ow by conduction through the unit and pipe ilange structure.

26. In structure for insulating pipe flanges, a pair of parti-circular and all-metal units each said unit including an outer shell of U-shape in cross-section, a smaller and similarly shaped inner shell, means on said inner shell for securing said two .shells together to provide a U-shaped space, a metallic sheet mounted in the base portion of said space in spaced relation to the shell base walls, outwardly extending flanges at the opposite ends of said outer shell adapted to receive means for fastening said pair of units to gether, and gasket means disposed between and throughout the opposite ends oi' said units and between said units and the pipe flange.

27. In structure for thermally insulating a valve having a body and valve operating stem projecting therefrom, all metal units which. when assembled upon the valve, provide a shelllike structure enclosing the valve body, each of said units including a plurality oi' spaced metallic sheets, said sheets having the general shape of a side portion of the valve body with their side edges turned toward the valve body and their top and bottom edges turned inwardly towards the valve stem and the bottom of the valve body. respectively, said sheet side and top edges being shaped to partially surround the valve body and stem, respectively, means for holding said sheets in spaced relation, and means for securing said units together to clamp them in position upon the valve structure with the valve body completely enclosed.

28. In structure for thermally insulating a valve having a body and valve operating stem projecting therefrom, a pair of similar all-metal units which, when assembled upon the valve, provide a shell-like structure enclosing the valve body, each of said units including a plurality of spaced metallic sheets, said sheets having the general shape of a side portion of the valve body with their side edges turned toward the valve body and their top and bottom edges turned inwardly towards the valve stem and the bottom of the valve body, respectively, said sheet sideA and top edges being shaped to partially surround the valve body and stem, respectively, metallic strips secured to and extending over the top, side and bottom edges of said sheet securing the latter together and sealing the spaces between the sheets apart from each other, gasket means mounted along said strips, and fastening devices supported by said strips for securing said pair of units together and to the valve structure.

29. In structure for thermally insulating a valve having a body and a valve operating stem, all-metal units each fitting over one side portion, a part of the top portion and a part of the bottom portion of the valve body, each said unit including a plurality of spaced metallic sheets, each of the shape of the unit and having particircular openings in their top and side edges receiving the valve stem and valve body, said sheets each being formed of a material of sufiicient thickness and stiffness to retain preformed shape and possessing relatively low reective characteristics when exposed to visible light and relatively higher reective characteristics when exposed to radiant heat, means for holding said sheets in a predetermined spaced relation, and means for detachably securing said units together and upon the valve structure to completely enclose the body of the latter.

30. In structure for thermally insulating a valve having a circular body and a projecting valve-operating stem, all-metal units each of such shape that when they are assembled upon the valve they completely enclose the latter, each said unit including a plurality of spaced metallic sheets with the inner sheet adapted to t over J OSEPH` M. LE GRAND.